Elbow-forming machine.



R. R. ROBERTSON.

ELBOW Form/UNG MAcHlNE.

' l' APPLICATION FILED NOV-16| i908. v

SQ., Patented Nov. y16, 1915..

3 SHEETS-SHEET l.

f R SN Nj N/ Y m v N. j w\\ 7 l CY BY 22W. I A ATTORNEY 5 HHTNESSES:

R. R. lOBER'SOIlIl ELBOW FORNIING MACHINE.

APPLICATION FILED Nov. I6, 1908.

Patented Nov., 16, 1915.

3 SHEETS-SHEET 2,

INVENTOR ,5 4 //.M m

BY XMI/2. mi

ATTORNEY 5 B. R.,ROBERTSON.

ELBOW FORIVHNG MACHINE.

APPLICATION FILED Nov. I6. 1908.

Pfented Nov. I6, 1915.

y 3SHEETS-SHEET3- e l l` y 7/ f1 I d5 IN VEN TOR wmvEssEs.- l Wt@ ROBERT R. ROBERTSON, OF CHICAGO, ILLINOIS, ASSIGNOR T AMERICAN SHEET METAL ELBOW COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION OF DELAWARE.

ELBOW-FORMING- MACHINE.

Speeication of Letters Patent.

Patented Nov. 16, 1915.

l To all whom t may concern.'

Be it known that I, ROBERT R. ROBERTSON, a citizen of the'United States, residing at Chicago, in the'county of Cook and State of Illinois, have invented new and useful Improvements in Elbow-Forming Machines, of which the following is a full, clear, concise, and eXact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention relates to improvements in machines for making pipe elbows.

The vobject of my invention is to provide a machinehaving comparatively few operating parts-which will crease a pipe, form the elbow, and fold or flatten the crease to presenta comparatively smooth surface on the insideof the pipe.

I have illustrated in the -accompanying drawings one embodiment of my invention for the purpose of disclosing the same.

In said drawings Figure 1 is a longitudinal section of the machine; Fig. 2 is a sectional view on the line 2-2 of Fig. l; Fig. 3 is a sectional view on the line 3 3 of Fig. 1; Fig. 4 is a sectional view on the line 4-4 of Fig. 1; Fig. 5 is an end view of my machine; and Figs. 6 to 10 are detailed sections, showing the 'various steps performed in the forming of the elbow. j

In the embodiment of my invention illustrated, I provide a frame comprising a base 1 and a pair of end standards 2 and 3. The base 1, at its rear end, is provided with a V-shaped socket for the reception of the rear end of the square reciprocating rod 4, the rod being turned on its edge, asv shown. Suitable holding-.plates 5 are bolted in the base to hold the rod in position. The front end of the rod carries a tapering plunger 6 having a peripheral slot or recess 7 formed therein at its rear end.

Arc-shaped jaws 8, 9 and 10 are arranged on the front of the machine. mounted on a vertically reciprocating plate 11, operating in guides 12, secured to a front plate 13, which in turn is secured to the` front' standard 2. Downward movement is imparted to the jaw by an eccentric cam 14 mounted on the rotating shaft 15 and adapted to engage a roller 16 on the plate. The jaws 9 and 10 are `mounted on horizontally reciprocating plungers 17 which operate in suitable guides and are moved inward by adjustable cams 18 mounted on the plate 11 The jaw 8 is,

and adapted to engage rollers 19 on the p lungers. The plate 11 and the plungers 17 are retracted by suitable coil springs 20. The jaws 8, l9 and 10 are so shaped and arranged that they will close in the arc of a clrcle of larger diameter than the annular groove 7, the center of. which circle is below the center of the plunger. By this arrangement, when the jaws are closed, they will,

crease the pipe into the peripheral recess on the plunger in suoliI a manner that the crease is deepest on the upper side of the pipe.

The plunger 6 is adapted to move in and out of a die 21 having tapering walls corresponding to the taper of the plunger and mounted in the plate 13. Motion is imparted to the rod 4 to operate the plunger by a cam wheel 22 mounted on the shaft 15. This wheel has a cam face 23 adapted to engage a plate 24 bolted on the rod 4 to move the rod backward and a cam face 25 adapted to engage a plate 26 to move the rod forward. The pipe is moved forward step by step as the creases are flattened by a pipe holder 27 slidably mounted on the rod 4. This holder is provided with gripping jaws 28 and 29, one of which is relatively movable, which are adapted to engage the rear end of the pipe, the movable jaw being locked shut by a locking lever 30. A dog 31, mounted on the holder, is adapted to engage ratchet teeth 32 formed on the bar 4, whereby a forward step by step movement is imparted to the holder.

The pipe holder 27 is held stationary during the formation of the crease, and during the flattening ofl the crease, by a holding member 33, which comprises a half wheel mounted on the shaft 15, and having a series of slots 34 in which is adapted to engage a projecting lug 35 mounted on vthe holder 27.

The shaft 15 is rotated by a suitable driving wheel loosely mounted. on the shaft and adapted to be connected thereto by a clutch 37 feathered on the shaft. A lever 38 pivoted to the rear standard is adapted tovinove upwardly, which is adapted to be engaged a projection 42 on the pipe holder 27, when the holder reaches the end of its movement.

In operation, the pipe is slipped over the 119 end of the pipe is clamped between the jaws 28 and 29 ofthe holder 27, and the holder is moved to its rearmost position. The'machine is now started, and the creasing jaws approach one another and force the pipe in -to the peripheral recess 7 on the plunger, the indentation being deepest on the upper side of theopipe, and, therefore, causing the pipe to bend upwardly. During the operation of creasing the pipe and .flattening the crease, the lug 35 on the pipe holder is in engagement with the first of the series of slots in the holding member 33 and the pipe is thus held stationary. As the crimping jaws are withdrawn the cam surface 23 engages the plate 24', `ov'ing the rod 4 rearwardly and with it the plunger 6. The pipe being still -held by the holding member 33 against movement a's'the -plunger moves into the die 21, the front'wall of the groove 7 engages the crimp, folding it over on to the interior surface of the pipe and the tapered face of the plunger follows and forces the folded crease up against the face of the pipe, flattening the crease and forcing the sides of the pipe outward so thatthe'inner surface of the pipe'will'be comparatively -srnooth. As the lap is completed, the dog 31 drops into engagement with the first of the ratchet teeth on the rod 4 and as the holding member has released the pipe holder the continued vrotation of the cam wheel causes the face 25 to en age the plate' 26, moving the rod forward:r and with it the l{ilpe This places the pipe in position for t e next crease .and the above operation is repeated.

Having thus described my invention, what I claim as new and desire' to secure by Letv ters Patent, is

1. In a device of the character described,

the combinationwith a stationary hor1zontally disposed bed, of vertical end pieces extending therefrom, a pipe supporting mandrel reciprocally mounted on said bed, a substantially cone-shaped crimp flattening head carried by said mandrel, crimpers carried by one of said 'end pieces, a rotary shaft journaled in said end pieces, and a doublefaced cam carried by said shaft and adapted to engage portions on said mandrel to reciprocate the same.

2. In a device of the character described,"

the combination with a stationary horizontally disposed bed, of vertical end pieces extending therefrom, a pipe-supporting man-V drel reciprocally mounted on said bed, a crimp-attening head carried by said mandrel, crimpers carried by one of said end y pieces, a rotary shaft journaled in said end pieces, a double-faced cam carried by said shaft and adapted to engage portions of said mandrel to `reciprocate the same, and means carried by said shaft for locking the pipe against movement during the crimping operation.

3. In a device of the character described, the combination with al stationary horizontally disposed, bed, of vertical end pieces eX- tending therefrom, a pipe-supporting mandrel reciprocally mounted on said bed, a

crimp-flattening head carried by-said man drel, crimpers mounted on'one'of said end pieces, a rotary shaft journaled in said endy operation, and a cam mounted on said shaft for operating the -crimpers 4. In a device of the character described, the combination with a bed, ofl a mandrel reciprocally mounted thereon, a pipe car'- riage detachably connected with said mandrel, a` rotary shaft, a vdouble-faced cam adapted to engage portions of said mandrel for reciprocating lthe same, a slotted eccentric mounted on said shaft, and a projection mounted on said pipe, carriage arranged to successively enter the slots on said eccentric, whereby vthe pipe carriage is held against Y movement during the turning of the crimp.

.5. In a machine of the class described, the combination with a die having a circular opening provided with Haring walls, of a head having an annular recess therein arranged to it Within the pipe, crimping means for forcing the metal of the pipe into said recess to form a crease, and a substanl' tially cone-shaped extension on said head toA force the crease against, the flaring walls thereof to compress thesame.

6. In a machine of the class described, the combination with a die having a circular opening provided with flaring walls, of a head having an annular recess therein arranged to fit within the pipe, one of the walls of said recess being inclined, crlmping means for forcing the metal of the pipe into said recess to form a crease, and a substantially cone-shaped extension on said head having the smallest portion of the cone at the end of the tapered wall forcompressing the crease against the walls of the die when drawn through `the die. In witness whereof, I have hereunto subscribed myl name in the presence of two witnesses.

ROBERT R. ROBERTSON. Witnesses:

H. PERRY HAHN, lClaras. L. HOPKINS.. 

